Download Slides - Agenda INFN

LNS Catania, February 20-23, 2012
Status of the mini-DOM in ANTARES
V. Popa
Short reminder
The idea of the project (“mini-DOM”):
A multi-PMT (5 PMTs) in an ANTARES sphere, enabled to receive power /
commands and send data from / to the standard ANTARES LCM electronics, will
allow to disentangle the L1 coincidence rate as a function of the space angle
between the PMTs.
A first multi-PMT test in deep sea (prior to a full KM3NeT DOM).
Main difficulty: The signal from the PMTs is in standard form, and the ANTARES
ARSs require analog input.
Principle of the summing board (Maarten)
The electronic board has to:
- combine the LVDS signals from two or more PMTs and
deliver an “analog” signal to the ANTARES ARS
- ensure the “slow control” of the device: commands
from shore on each run configuration, send
information on the acquisition status, control the PMT
high voltage
- ensure the power to all the components inside the
DOM
The miniDOM becomes real at CPPM!
(Almost) all components are there and undergo tests
Pressure tests completed in Catania; the upper hemisphere send (arrived?) to CPPM
Detached foam. Will be
solved at CPPM, during
integration
New vacuum valve (mounted in Catania)
“old” vacuum valve
Last week, at CPPM.
The lower hemisphere, with 5 PMTs, from NIKHEF
+
The lower hemisphere, with 5 PMTs,
from NIKHEF
+
Electronics from ISS
=>
Standard LCM (CPPM)
All ingredients!
Tests started…
Test summary:
• Powering the electronics from the switchable LCM 48V lines. Failed due to
the large capacitors at the board power entry; to be solved soon (various
possibilities investigated)
• Communication with the board trough the LCM (RS232 and MODBUS) OK on
all channels; configuration of the board and of the high voltages and
thresholds works properly. A friendly user interface to be developed soon.
• PMT’s coupled to the electronic board.
• Tests in the black box. One connector (base of
PMT 2) disintegrated due to bad soldering . 4
remaining channels OK. The connector could be
changed with a new one, to recover also the fifth
PMT.
First 30 s run, minimum HV and thresholds, L0 background rate about 75 kHz
• After some firmware corrections, first runs in waveform mode OK.
• All news are now available on e-log.
https://sbgelog.in2p3.fr/INTEGRATION_CPPM/
Today news…
Today news…
Today news…
To do list:
• solve the power problem
• recover the fifth PMT
• integrate the mini-DOM
• final tests
Conclusion: We are optimistic! The mini-DOM could be ready for integration in the
IL011 by the end of the month!